sh: Shuffle the board directories in to mach groups.

This flattens out the board directories in to individual mach groups,
we will use this for getting rid of unneeded directories, simplifying
the build system, and becoming more coherent with the refactored
arch/sh/include topology.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/boards/mach-r2d/Kconfig

@@ -0,0 +1,23 @@
+if SH_RTS7751R2D
+
+menu "RTS7751R2D Board Revision"
+
+config RTS7751R2D_PLUS
+	bool "R2D-PLUS"
+	help
+	  Selecting this option will configure the kernel for R2D-PLUS.
+
+	  R2D-PLUS is the smaller of the two R2D board versions, equipped
+	  with a single PCI slot.
+
+config RTS7751R2D_1
+	bool "R2D-1"
+	help
+	  Selecting this option will configure the kernel for R2D-1.
+
+	  R2D-1 is the larger of the two R2D board versions, equipped
+	  with two PCI slots.
+endmenu
+
+endif
+